Patent US3824036A successfully refreshed from Google Patents.
US3824036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine rotors
Assignee: British Leyland Truck and Bus Div Ltd
•
Filing: 1972-01-12
•
Granted: 1974-07-16
•
Expires: 1992-01-12
Abstract
Abstract An integrally cast gas turbine rotor, with a continuous rim existing at the roots of its blades, is characterized by having the blades rooted also to a second continuous rim situated at a smaller radius, such that this inner rim is subject to temperatures (and hence thermal stresses) significantly lower than those experienced by the existing outer rim.
Inventors
- 👤 R Penny
- 👤 P Parker
- 👤 C Silverstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:33
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
An integrally cast turbine rotor having a continuous outer rim supporting the roots of a plurality of blades, and a coaxial annular axially thickened portion having a radius smaller than that of said rim, said rotor defining a plurality of holes between said rim and annular thickened portion, said holes being equal in number to said blades and each hole being positioned between the roots of two adjacent blades, said holes being obturated by low-density, high-temperature, air-permeable metal plugs having a sufficient resistance to air flow therethrough to maintain a pressure differential between the two sides of the rotor during normal use.
Claim 2
Dependent Claim
102 words
An integrally cast turbine rotor having a continuous outer rim supporting the roots of a plurality of blades, and a coaxial annular axially thickened portion having a radius smaller than that of said rim, said rotor defining a plurality of holes between said rim and annular thickened portion, said holes being equal in number to said blades and each hole being positioned between the roots of two adjacent blades, said holes being obturated by low-density, high-temperature, air-permeable metal plugs having a sufficient resistance to air flow therethrough to maintain a pressure differential between the two sides of the rotor during normal use.
Claim 3
Dependent Claim
35 words
An integrally cast gas turbine rotor according to claim 1 in which the radius of said annular thickened portion is approximately two-thirds of the blade height less than the radius of the continuous outer rim.
Claim 4
Dependent Claim
51 words
An integrally cast turbine rotor according to claim 1 in which said holes are centered on a pitch circle having a radius which is the mean between the radius of said rim and that of said annular thickened portion and are approximately parallel to the mean camber line of the blades.
Claim 5
Dependent Claim
46 words
An integrally cast turbine rotor as claimed in claim 1 in which said plugs have a density of less than 0.54 g/cc and a permeability which permits the flow of cooling air therethrough, said holes are radially elongated, and said plugs are brazed into said holes.
References Cited (Backward Citations)
US874398A
Cited
US2665881A
Cited
FR1017511A
Cited
US2807434A
Cited
US3255994A
Cited
US3262675A
Cited
US3262674A
Cited
US3262676A
Cited
US3291446A
Cited
US3730644A
Cited
US3664766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |